Filtering system



y 1930- N. PERKINS 1,758,331

FILTERING SYSTEM Filed'Oct. 16, 1928 2 s ets sheet 1 ,1 a &\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ frZ'w'w" May 13, 1930. R. N. PERKINS FILTERING SYSTEM Filed Oct. 16, 1928 2 Sheets-Sheet 2 anus-W601;

Patented May 13,1 193i) I I l UNITED STATESJ PATENT or-Frca f Burn 1:. margins, or mm minaesxa FILTERI G SYSTEM Application filed October 16, 1928. Serial No. 812,789.

The invention relates to filtering systems, treating chemical may be fed by gravity into particularly of the kind used in connection the water before it is filtered.

with swimming pools, and has for its object A further object is to apply the force which to provide a system wherein water is taken actuates the passage of water through the off from the bottom of the swimming pool, filter below the top of the filter'sand, so the 50 preferably from the lowest portion thereof, flocculent precipitate of aluminum hy r0x'- and is discharged into a sediment trap from ide, used to seal the space between the grains which it flows intofilters above the beds thereof sand is held firmly in place and prevents of and pum means connected to perforated the passage of unfiltered water. pipes exten ing into the filter beds and form- A furt er object is to construct an open 5 in means whereby water'is sucked from the filter having a minimum depth andone where- A he s. in capacities as high as four to five gallons A further object is to provide a system of er minute may be passed through one square J perforated laterals connected to a header in oot of filter surface without building the the bottom of the cells over which gravel and cell sufiiciently high to establish the neces- 60 sand is laid, and a collector system of pipes sary column head to accomplish this. connecting the headers to a suction pump, With theabove and other objects in view forms means whereby water is sucked through the invention resides in the combination and the filter beds. ar rangement of parts as hereinafter set forth,

with a discharge pipe leadm back to the it being understood that changes in the preool, into a clear well, a stan pipe, or 'elecise embodiment of the invention may be vated tank, forming means wherebywith one made within the scope of what is claimed pum ing operation, water ma be filtered without departing from the'spirit of the ing5 and elivered to the desired en vention. 70 A further object is to dis ose the pump be- In the drawings: low the water level in the ter so as to obvi- Figure 1 is a vertical transverse sectional ate the necessity of priming view through the filter and swimming pool 'A rther object is to provide the pump showing the system applied thereto. r so suction and discharge lines with a by-pass Figure 2 is a top plan view of a portion of 75 pipe connection between the suction line and the filter, and the sediment trap. the discharge line leading from the swimmin Figure 3 is a vertical sectional view taken 001 and valves carried by said lines an online3-3 of Figure 2. k orming means whereby water maybe by- Referring to the drawings, the numeral 1 passed through the suction lineand forced designates a swimming pool and 2"an outlet so upwardly through the filtering bed for back trough therein, which is at the lowest portion washing the beds. of the pool, andis connected by means 0 a A further object is to provide a branch discharge pipe 3 with a sediment trap 4 at a ipe in connection with the suction line and lower level than the said trough 2, so as to disposed within the sediment trap, and proermit' water by means of gravity force to as vided with a valve, which valve w on opened e freelg' discharged into the sediment trap will allow the pump to suck the water from ,4. -Sai pipe 3 is provided with a valve 5 so the sediment trap when so desired. that compartments 6 and 4: may befdl allledf A further object is to supply, b the comand cleaned when desired.

partment supplying the filters, a p ace where Under normal conditions of action the wa- A further object is to provide the pump shown in the drawings, described and claimed,

ter in the compartment supplying the filters (caused by the accumulation of refuse upon Will maintain a level such that the gravity the beds) a vacuum gauge 27, conspicuously inflow through the pipe 3 willbe equa to the located in the operating room, is provided. actuated discharge "into the pool 1, of the The same being connected with a pipe 28 pump 7, which of course, could only occur leadingthrough the sediment trap 4 to its after the Water had reached a suflicient level connection with the suction pipe 11 adjacent to permit the water toflow into a compartits valve 13. Under some circumstances the ment 8- over a steel trough 9, from which comdepth of the sewer is such that the drain line partment it is sucked downward through the 21 can not be laid as low as shown in Figure built up sand bed.10, passing through aper- 1 and it is then necessary that the pipe line tures in the lower side of the discharge pipe 21 b br ught i t the om artm t u ly- 11 from whence it is returned through the ing th filter at hi h r el ti n,

pump to h immi g P The SllctlOIl Under such conditions a small sump is pipe adjacent the pump 7 is pref ra ly P built into the bottom of the sedimenttrap vided with a valve 12 by means of which the 4 andfl ti n i 23 i t nded d wn passage Way of Water through th Suction into this sump and the discharge pipes 15 pi e o 1 b closed- Th plp 1 s PI bifurcated and provided with valves so the L V ed l a ond Valve Which Is 0011- water remaining in the bottom of the sedir d y a Valve 14 located P the ment trap not carried away by the waste outoperatmg floor where it can be conveniently l t, may b pumped th h th id Sump manipu atedpipe and discharged into the sewer or other Connected to the pump *7 1s a discharge convenient tl t P P which Q es into the Swimming It will also be seen that a suction or nega- PP therefore 1t 1 be Seen that a 0011- ti ve head filter principle is'used, thereby protlllllOllS flow of water is maintained at all di a system h i th i m flfi- I t T P ll t l h its 'g' clency is obtained. The advanta e of the mg end s provlded h a valve which suction filter is, that it does away with buildpass is provided with a valve 18, which when Sand is maintained by closed will cut out the b -pass passage.

I valves 5, 12 and 16 closed and the valves 18 purpose d li t d has the double/ function of controllin through partial closure, the flow of wate i 33g, gg ga fig zggg g gz necessary the therethrough, or when completely closed will b l c d upon he h of water above the cause the water to be forced in a reverse dil I th case of a pressure filter which lectloh' through 'P P P 17 Whlch y must'be closed on top, the head above the a pump as a hydraulic pressure. In a suction filter onl suflicient Connec ed to the Suctlon P p 11 between head room need be provided abov e the sand the P p 7 and the Valve 12 1S a P P? 19 Whlch which will act as a seal between the compartpipe is In turn connected to the pipe 3 and ments d th t fth l P Q with a controlling 2 W It is to be understood that the present it is deslred to back Wash g bed 1 filtering system may be used for water purithe valve 20 carried by the pipe 19 is opened, fi ti l t i i g pools or an th 106 not limit imself and p therefore 1t W111 he See11 that in this respect. In case of use to filter a citys the p p 7 1 suck Water from the p p 3 supply of water the plant is built adjacent to and force the water through the by-pass 17 the settling basin and the water pipes to the and thence through the su tion pipe 11 n compartment supply filters. No clear well or upwardlythrough the filter bed, thereby stbrage compartment below the filter lant, is cleansln the filtering material. The water necessary in thi a e, for the water 5 during t eback washing operation flows Int gravity from the settling basin to the filtert e sediment trap from which it is drained mg plant, is filtered by suction and is pumped 7 through the pipe 21 when the valve 22 is directly to the stand pipe or into the main opened. There is also provided a sump suc-. eliminating the expense of clear well construct1on pipe 23 controlled by a valve 24 by tion.

. m ns f 8 Valve Stem 25 which, When the From the above it will be seen that a filtervalve 24 is open, enables water to be sucked mg system is provided in connection with a from the compartments 6 and 4 down to the swimming pool and in which system water is bottom of the pipe 23. 'The bottom of the sucked through afiltering bed and is recircufilter is preferably provided with a drain lated through'the filter and swlmming pool pipe 26, which discharges into the sediment h r b the water will be maintained clean trap 4, and through which water may be in the pool. drained from the bottom of the filtering The invention having been set forth what chamber when desired, for instance the water is claimed as new and useful is: below the perforated portion of the suction The combination with a swimmin pool pipe 11. j and filtering tank, a filtering material in said As a means for ascertain ng the resistance filtering tank, a sediment tank, a pipe carried controlling the flow of water through theband by the swimming tank and discharging into the sediment tank, a suction pump disposed below the water level of the swimming pool and filtering tank, a suction pipe extending into the .filterin material and connected to the pump, a ischarge pipe connecting the pump and the swimming tank and a by-pass pipe connecting the pump, suction and discharge pipes and in combination with a pipe connection between the pump suction pipe and the first mentioned pipe forming means whereby the filtering material may be back washed.

In testimony whereof I hereunto afix my signature.

RALPH N. PERKINS. 

